Well it ended up taking a little time and fiddling to get the valves, retainers and springs back in however Joe�s trick with the cable ties worked just about perfectly. To help out others I found using 3 ties evenly spaced around the spring helped ensure the retainer didn�t pop out of position when I cut the first cable tie. A pair of long nose side cutters would also make the job a little easier however I don�t see the investment as being worthwhile.
I checked to make sure the valves were not sticking before re-installing the valve chest cover and engine head. I also re-checked the clearances with the springs installed and they fell within the correct tolerances.
After putting the exhaust back on, it fired up on the first pull. I let it run for about 10 odd minutes (idle and full speed) to see if I got the same popping sound as previously noted and������.. no popping from the exhaust. Just the occasional side valve misfire.
I won�t count my chickens until I put the engine under some reasonable load however I am fairly confident the engine should be good to go.
Whilst I now have a reasonable understanding of completing a valve grind and lapping job I am still curious how this removed the popping sound from the exhaust. I am assuming it is due to the valves not opening and closing as they should however I wouldn�t mind satisfying my own curiosity if you would care to share.
Again I really appreciate your help with this one.
